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https://issues.apache.org/jira/browse/HIVE-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Xu updated HIVE-5771:
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Attachment: HIVE-5771.patch.javaonly
[~hsubramaniyan] Thanks for your comment, the typo is corrected.
[~ashutoshc] Thank you for your patch! I already merge your changes to the
latest patch. The wrap up work turned out a bit longer than I expected. I think
I fixed most of the failures in unit tests, but there is still failures
including:
# HashMap print order is uncertain, e.g., char_udf1.q, explain_dependency.q
# The iteration order of MapWork.getPathToAliases(), which is already a
LinkedHashMap, is still uncertain.
(They also failed on hive trunk clean build on my laptop. I'm using osx 10.9.2
and jdk 1.8.0_05)
I'm uploading the java only patch as an early preview. [~ashutoshc], I'm sorry
but could you please help me verify it on your working directory? Thanks!
> Constant propagation optimizer for Hive
> ---------------------------------------
>
> Key: HIVE-5771
> URL: https://issues.apache.org/jira/browse/HIVE-5771
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Ted Xu
> Assignee: Ted Xu
> Attachments: HIVE-5771.1.patch, HIVE-5771.10.patch,
> HIVE-5771.2.patch, HIVE-5771.3.patch, HIVE-5771.4.patch, HIVE-5771.5.patch,
> HIVE-5771.6.patch, HIVE-5771.7.patch, HIVE-5771.8.patch, HIVE-5771.9.patch,
> HIVE-5771.patch, HIVE-5771.patch.javaonly
>
>
> Currently there is no constant folding/propagation optimizer, all expressions
> are evaluated at runtime.
> HIVE-2470 did a great job on evaluating constants on UDF initializing phase,
> however, it is still a runtime evaluation and it doesn't propagate constants
> from a subquery to outside.
> It may reduce I/O and accelerate process if we introduce such an optimizer.
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